Harby l



March 29, W27.. y

H. FETTERLY AUTOMATI C DAMPER Filed DeC, 26, 1925 Patented Mar. 29, i927.

(MFEC.

AUTOMATC DAMPER.

Application filed December 26, 1923. Serial No. 682,632.

My device relates to draft-operated automatic dampers, and its objects are to secure a cheap, durable service that is safe, sensitive, and eiiicient'in operation.

I attain these objects in the device shown in the drawings and described in the speci- `lications of this application, as preferably constructed.

In this device, the draft in the smoke-pipe is controlled by the combined action of two valves, one located in the smoke passage of the smoke pipe, and the other adapted to an air check inlet admitting air into the smoke pipe from outside the pipe, the valves being actuated by the pressure of the draft in the smoke pipe on the valve in the smoke passage, combined with the suction of the draft on the valve located at the air check inlet, such pressure and suction, acting in agreement throughout the range of movement of the valves.

Similar letters and similar numerals refer to similar parts of the device throughout the drawings and specifications.

Figure l, of the drawings, is a front elevation of the device, as preferably constructed.

Figure 2 of the drawings, is a plan of the device, as preferably constructed.

Figure 3, of the drawings, as a vertical section of the device on the line X Y of Figure l.

Figure 4, of the drawings, is a vertical section through the center of another form of the device.

Figure 5, of the drawings, is a plan of the device as shown in Figure 4C.

The numeral l, of the drawings, denotes a rectangular smoke pipe vertically disposed.

The numeral 2, of the drawings, denotes yan opening in the back of the smoke pipe serving as a secondary air check inlet.

The numeral 3, of the drawings, denotes a rectangular chamber secured in a horizontal position to the back of the smoke pipe as an air check chamber. The air check chamber has an opening registering with the opening 2, and extends to the left of the smoke pipe.

VThe numeral t, of the drawings, denotes a valve rod which passes horizontally along the air check chamber near the lower front corner of the same, and which is pivoted in the walls of the device.

The numeral 5 of the drawings, denotes a flat rectangular valve, shown in dotted lines in Figure l as extending into the smoke pipe. @ne edge of the valve is secured to the valvev rod and the valve rotates with the valve rod.

rlhe numeral 6, of the drawings, denotes another fiat rectangular valve, shown in dotted lines in Figure l, one edge of the valve being secured to the valve rod within the portion of the air check chamber which extends to the left side of the smoke pipe. in the front of this extension of the air check chamber is a rectangular opening, communicating' with the air outside the smoke pipe, serving as an air check inlet, and controlled by valve (5. Valve G is in practically the same plane as valve 5, butA is on the opposite side of the valve rod.

rlhe numeral 7, of the drawings, denotes a vertical partition in the air check chamber, extending from the top to the bottom of the chamber, but only a part of the distance from the front toward the rear. Partition 7 is not essential to the operation of the device. It is used merely to cause the current of air striking valve 6 to act more effectively than it would if the partition were not used. This increased effectiveness is gained by causing the current of air to flow toward the rear of the air check chamber, instead of merely passing along the front of the same toward the openingl 2.

The numeral 8, of the drawings, denotes an arm adjustably secured to the valve rod at a right angle to the plane of the valves outside the smoke pipe and the chamber 3.

The numeral 9, of the drawings, denotes a weight which is supported by arm 8, and which may be adjusted along the arm.

rlhe smoke and gas in the smoke pipe move upward. rlhe suction of the draft in the smoke pipe will draw air past valve 6, around partition 7, and through the opening 2, into the smoke pipe.

ln my device, the draft in the smoke pipe, and, consequently, the amount of the re, is automatically controlled by the combined action of two valves; one valve located in the smoke pipe, and the other adapted to an air check inlet admitting air from outside the device into the smoke pipe, the valves being actuated by the pressure of the draft in the smoke pipe upon the valve located therein combined and co-operating with the suction` ofthe draft on the valve at the air check inlet, each of the valves opening the passage it controls as the other valve closes the passage it controls.

By manually adjusting the weight 9 along the arm 8, any desired amount of draft, and, consequently, any desired amount of fire, may be automatically maintained between the intervals of such manual adjustment.

By adjusting the arm 8 so it will lie in the samey plane as the valves, as shown in dotted linesin Figure 1, of the drawings, the device is adapted for use with a smoke pipe lying in a horizontal position; and a similar adjustment ofthe arm S, though of lesser degree, adapts the device to a smoke pipe occupying any position between the vertical and horizontal ones.

In the form of my device shown in Figures 1, 2,\and 3, of the drawings of the specilication, the force exerted by the pressure of the drafton valve 5, and the force exerted by the suction of the draft on valve G vary according to the angular position of the valves relative to the current of air or gas passingl them. Eaclrof these forces varies from a maximum amount to nothing, the force acting on each valve increasing as the force actingl on the other valve decreases. These forces, thus. supplement each other, producing a fairly uniform turning effort, or torque, upon the valve rod throughout the range of movement of the valves, so permitting the valves to move a considerable distance with but a slight change in the amountof the draft.. These conditions, together with the arrangement of the valves practically counterbalancing each other in all positions-they may assume, assures sensitivenessof automatic operation of the device foi-.all ositions to which the valves may be manual y adj-usted to obtain dili'erent amounts of fireA The dual control ofthe draft obtained by closing the smoke pipe as the air check inlet is opened, .and vice versa, gives complete control of the draft, and, consequently, of the fire.

My device as shown in Figures l and 5 of the drawings, has a lever fulcruined in the wall lof the smoke pipe supporting directly the valves and the weight 9, so combining inthe leveralone the functions, somewhat modi'lied, of the valve rod and the arm 8 asused in the preferred form of the device; the air check inlet is opposite the fulcrrun ofthelever; and the weight t) partly counterbalances the valves.` a portion of the weight of the valves being-` used to oppose the draft. This construction eliminates the air check chamber used in the preferred construction.

l'n its broader view, the mode of operation of 'this form of my device is the same the mode of operation of the preferred foun of the device; but in this form, the airl check passage and the `smoke pipe passage are permanently obstructed by the valves to a greater extentthan they are in the preferred form of the device, and the supplemental relation of the valves heretofore mentioned herein is modified, correspondingly affecting the result achieved and the mode of operation when they are considered in their narrower phases.

I claim:

1. The combination consistingof a smoke pipe having an air check inlet; a valve supw iris port; a valve secured 4to the valve supportl and adapted to the air check inlet; andv another valve secured near one of itsedges to the valve supportandadapted to the smoke pipe between the air check inlet and the furnace.

The combination consisting of a smoke pipe having an air check inlet; a valve support; a valve secured to the valve support and adapted to the air check in1et;`

and another valve adapted to the smoke pipe between the air check inlet and the furnace,

and adapted to co-operate with the lirstnientioned valve to automatically operate both valves.

3. The combination consisting of va smoke pipe having an air check inlet; a valve support; a valve secured to the valve support and adapted lto the air check inlet; and means between the air check inlet andthe furnace to control the passage through'y the smoke pipe and co-operate with thevalve to actuate itself and thevalve.

4;. The combination consisting of a device such as described lin claim l combined with meansl to variably oppose the draft.

5. The combination consisting of a device such as described in claim 2 combined 'with means to variably oppose thel draft.

6. The combination consistingof a device such as described in claim 3 combined with means to variably oppose the draft.

7 The combination consistingof adevice such as described in claim` 1 combined with an air check chamber between the air cheek inlet and the smoke pipe.

8. The combination consisting of a deviceV such as described in claim 2 combinedwith an air check chamber between the air check inlet and the smoke pipe.

9. The con'ibination` consisting of ya device such as described in claim 2:5 combined with an air check chamber between the air check inlet and the smoke pipe.

10. The combination consisting of a .device such as described in claim 1 combined with. an air check chamber between the air checkr inlet and the smoke pipe, and means to Variably oppose the draft.

ll. The combination consisting of a device such as described in claim 2 combined with an air check chmber between the air check inlet and the smoke pipe, and means to variably oppose the draft.

12. The combination consisting of a device such as described in claim 3 combined with an air check chamber between the air check 10 inlet and the smoke pipe, and means to variably oppose the draft.

In testimony whereof, I aiiix my signature.

HARRY L. FETTERLY. 

